#include <stdio.h>

void swap(int *a, int *b) {
  int t = *a;
  *a = *b;
  *b = t;
}
int main() {
  int n1, n2;
  n1 = 1, n2 = 2;
  swap(&n1, &n2);
  printf("%d %d", n1, n2);
  return 0;
}
